Past threads and posts have mentioned using multiple cabs that weren't originally married together. In the 80's and early 90's, it seemed as though the subject of speaker phasing for multiple cabs was always a topic. A couple of bands I was with years ago had a tech, (they used to be "roadies"), who made sure our speakers were in phase. I don't see the topic discussed anymore and I get around a lot. Is this still an important consideration, or did some technological breakthrough occur is the mid-late `90's that made this a non-issue?